Firmware code of 8x8 RGB matrix driver

folks where can i find the firmware for the on board micro-controller STM32F031 of the RGB LED Matrix?
i could not find the firmware or documents explaining how to program the chip. can someone point me in the right direction?
i basically want to edit the i2c address of the matrix, so that i can interface multiple matrices to one arduino.

check it out…
GL :slight_smile: PJ